The Clipsal 755PSMA4 is designed using photoelectric technology for detection of smouldering fire types. Smouldering fires are among the most common fire types in homes. Designed to be surface mounted on the ceiling, the Clipsal 755PSMA4 photoelectric smoke alarm can be used as a single mains powered, battery backed alarm or interconnected with other 755 series smoke alarms to protect the your entire home. With its modern, clean design it will seamlessly integrate into any home environment and has a range of features: For Shoping click here: https://electrical.com.au/755psma4-clipsal-smoke-alarm-photoelectric-firetek-surface-mount-240v-mains-powered-9v-battery-backup.html